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- Beardall 2005 Can J Bot + (Inorganic phosphorus (P<sub>i</su … Inorganic phosphorus (P<sub>i</sub>) is often the primary limiting nutrient in freshwater ecosystems. Since P<sub>i</sub>-limitation affects energy transduction, and inorganic carbon (C<sub>i</sub>) acquisition can be energy demanding, C<sub>i</sub>-acquisition strategies were compared in four species of green algae grown under P<sub>i</sub>-replete and P<sub>i</sub>-limited conditions predominantly at low and partly at high CO<sub>2</sub>. Although P<sub>i</sub>-limitation was evident by the 10-fold higher cellular C:P ratio and enhanced phosphatase activity, it only decreased C<sub>i</sub>-acquisition to a small extent. Nonetheless, the effects of P<sub>i</sub>-limitation on both CO<sub>2</sub> and acquisition were demonstrated. Decreased CO<sub>2</sub> acquisition under conditions of P<sub>i</sub> limitation was mainly visible in the maximum uptake rate (''V''<sub>max</sub>) and, for the neutrophile ''Scenedesmus vacuolatus'', in the affinity for CO<sub>2</sub> acquisition. Discrimination against <sup>13</sup>C was higher under P<sub>i</sub>-limited, high CO<sub>2</sub> conditions, compared with P<sub>i</sub>-replete, high CO<sub>2</sub> conditions, in ''Chlamydomonas acidophila'' and ''S. vacuolatus''. In the pH-drift experiments, acquisition was reduced in P<sub>i</sub>-limited ''C. reinhardtii''. In general, energy demanding bicarbonate uptake was indicated by the less strong discrimination against <sup>13</sup>C under low CO<sub>2</sub> conditions in the neutrophiles (HCO<sub>3</sub><sup>-</sup> users), separating them from the acidophilic or acidotolerant species (CO<sub>2</sub> users). The high variability of the influence of P<sub>i</sub> supply among different green algal species is linked to their species-specific C<sub>i</sub>-acquisition strategies.ons in the neutrophiles (HCO<sub>3</sub><sup>-</sup> users), separating them from the acidophilic or acidotolerant species (CO<sub>2</sub> users). The high variability of the influence of P<sub>i</sub> supply among different green algal species is linked to their species-specific C<sub>i</sub>-acquisition strategies.)